Re: [RFC][PATCH 6/8] mm: handle_speculative_fault()

[Linus Torvalds]

On Wed, 6 Jan 2010, KAMEZAWA Hiroyuki wrote:
> > 
> > Of course, your other load with MADV_DONTNEED seems to be horrible, and 
> > has some nasty spinlock issues, but that looks like a separate deal (I 
> > assume that load is just very hard on the pgtable lock).
> 
> It's zone->lock, I guess. My test program avoids pgtable lock problem.

Yeah, I should have looked more at your callchain. That's nasty. Much 
worse than the per-mm lock. I thought the page buffering would avoid the 
zone lock becoming a huge problem, but clearly not in this case.

		Linus
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